\(\ell \)  denotes the NT-Xent Loss [1]}, which can be written as,
\(\small \ell (i,j) = -\log \frac{\exp {(cos(z_i,z_j)/ \tau )}}{\sum _{k=1}^{2N}\mathbb {1}_{k\ne i}\exp {(cos(z_i,z_k)/ \tau )}},\) 
